Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Electrical & Electronics Expert

1) describe the data needed for estimating the regulation of alternator by the potier method. Describe how regulation is determined for different power factor.

2) Determine the synchronous impedance and reactance of an alternator where the given field current generates an armature current of 200 A on short circuit and a generated E.M.F of 50 V on open circuit. The armature resistance is 0.1 ohm. To what induced voltage should the alternator be excited if it is to deliver the load of 100 A at a pf of 0.8 lagging, with a terminal voltage of 200 V.

3) Describe the effect of varying the excitation upon the armature current and power factor of the synchronous motor for a constant output with the help of phasor diagram.

4) a) A 500, 1 Phase synchronous motor provides a net output mechanical power of 7.46 KW and operates at the 0.9 pf lagging. Its effective resistance is 0.8 ohm. If iron and friction losses are 500 W and excitation losses are 800 W, determine the armature current. Find the commercial efficiency.

b) A 75 KW,3 phase star connected ,50 Hz , 440v cylindrical rotor synchronous motor operates at rated condition with 0.8 pf leading. The motor efficiency excluding field and stator losses, is 95% and Xs =2.5 ohm. Find:

i) Mechanical power developed

ii) Armature current

iii) Back e.m.f

iv) Power angle

v) Maximum or pull out torque of the motor.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M913269

Have any Question? 


Related Questions in Electrical & Electronics

1 list the components of a traffic conditioner in diffserv2

1. List the components of a traffic conditioner in DiffServ. 2. Is the flow label in IPv6 more appropriate for IntServ or DiffServ?

1 a program for encoding and decoding lzw compression2 a

1. A program for encoding and decoding LZW compression. 2. A program for encoding and decoding arithmetic compression. 3. A program that reads a two-dimensional matrix of size N × N and writes the values using zigzag ord ...

A module with 40 cells has an idealized rectangular i-v

A module with 40 cells has an idealized, rectangular I-V curve with I SC = 4 A and V OC = 20 V. If a single cell has a parallel resistance of 5Ω and negligible series resistance, draw the I-V curve if one cell is complet ...

Question 1 design a suitable double -layer lap winding for

Question 1) Design a suitable double -layer lap winding for a 6-pole dc armature with 18 slots and two coil sides per slot. Give values of front-pitch, brack-pitch and commutator pitch. Draw the developed diagram and sho ...

1 how do you find the exact value of the line integral2

1. How do you find the exact value of the line integral? 2. What is the physical significance of the line integral of the earth's gravitational field intensity? 3. What is the value of the line integral of the earth's gr ...

1 distinguish between bound electrons and free electrons in

1. Distinguish between bound electrons and free electrons in an atom. 2. Briefly describe the phenomenon of conduction. 3. State Ohms' law applicable at a point. How is it taken into account in Maxwell's equations? 4. Br ...

1 we discuss the use of sip in this chapter for audio is

1. We discuss the use of SIP in this chapter for audio. Is there any drawback to prevent using it for video? 2. Assume two parties need to establish IP telephony using the service of RTP. How can they define the two ephe ...

1 what are the two types of firewalls2 what is a vpn and

1. What are the two types of firewalls? 2. What is a VPN and why is it needed? 3. How do LANs on a fully private internet communicate? 4. Host A and host B use IPSec in the transport mode. Can we say that the two hosts n ...

Can sell them for on a dollarper-square meter basis to make

can sell them for on a dollarper-square meter basis to make the resulting PV system no more expensive than when using a fixed mount system. Using simple dc, STC ratings along with the following assumptions, how much can ...

1 what is the magnetic flux crossing an infinitesimal

1. What is the magnetic flux crossing an infinitesimal surface oriented parallel to the magnetic flux density vector? 2. For what orientation of the infinitesimal surface relative to the magnetic flux density vector is t ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen